XSL-Transformation: escape tags and keep attributes within this tag - xslt-1.0

Question

I'm an absolute beginner concerning xsl transformation and I have a problem one of you may can help me with. I have following xml block:
<Metrics>
<Metric name="DocAmount" value="123.21" currency="GBP" type="Total"/>
<Metric name="Invoices" value="113.21" currency="GBP" type="Total"/>
<Metric name="Credit" value="10.00" currency="GBP" type="Total"/>
</Metrics>
I have to escape the "<" and ">" from the inner elements "Metric" and keep at the same time all attributes with their values => I want to have this:
<Metrics>
<Metric name="DocAmount" value="123.21" currency="GBP" type="Total"/>
<Metric name="Invoices" value="113.21" currency="GBP" type="Total"/>
<Metric name="Credit" value="10.00" currency="GBP" type="Total"/>
</Metrics>
I already searched here in stackoverflow and found a way to escape the "<" and the ">" but with my xsl template the attributes arn't copied and I get this here:
<Metrics>
<Metric></Metric>
<Metric></Metric>
<Metric></Metric>
</Metrics>
To get this I used following xsl template definition:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" omit-xml-declaration="no" encoding="UTF-8"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="Metric">
<xsl:value-of select="concat('<',name(),'>',.,'</',name(),'>')" />
</xsl:template>
</xsl:stylesheet>
Can anybody help me to setup a correct xsl template doing what I want to have?
Thanks a lot in advance for your help!

Answer 1

As your question is tagged as XSLT 2 and these days we have XSLT 3 and the main XSLT 2.0 implementations like Saxon 9 with Saxon 9.8 or Altova with Altova 2017 or 2018 have been updated to support XSLT 3 I think the easiest and most elegant solution is to move to XSLT 3 and use the XPath 3 serialize function:
<xsl:template match="Metric">
<xsl:value-of select="serialize(.)"/>
</xsl:template>
As your comment indicates you have namespaces in your input you don't want to be serialized you can use
<xsl:template match="Metric">
<xsl:variable name="copy" as="element(Metric)"><xsl:copy-of select="." copy-namespaces="no"/></xsl:variable>
<xsl:value-of select="serialize($copy)"/>
</xsl:template>